package lianshoo;

public class StringMethodExt {
    public static void main(String[] args) {
        String s1 = " you can kill me , you can't fuck me ";
        System.out.println("s1=" + s1);
        //String toUpperCase():将当前字符串子目全部转为大写
        String s2 = s1.toUpperCase();
        System.out.println("s2=" + s2);
        //String tolover
    }
}
